Au/MCr2O4 (M = Co, Mn, Fe) catalysts in the oxidations of CO, C-2, and C-3 hydrocarbons

作者：Grzybowska Swierkosz B^*; Ruszel M; Grabowski R; Kepinski L; Malecka M A; Sobczak J

来源：Reaction Kinetics, Mechanisms and Catalysis, 2012, 105(1): 69-78.

DOI：10.1007/s11144-011-0377-1

• Au/CoCr2O4
• Au/MnCr2O4
• Au/FeCr2O4 catalysts
• Oxidation of CO
• Ethane
• Propane
• Propene
• Reducibility
• Particle size effect

Au/(MCr2O4)-Cr-II (M-II = Co, Mn, Fe) catalysts have been tested in the total oxidation of ethane, propane, propene at 300 degrees C and of CO at 35 degrees C, and characterized by TEM, XPS and hydrogen thermo-programmed reduction (H2TPR). The catalytic activity has been found to depend on the nature of the oxidized compound. For the CO and ethane oxidation, the activity decreases in the sequence Au/CoCr2O4 > Au/MnCr2O4 >> Au/FeCr2O4 and follows the sequence of the decreasing reducibility of the supports and the catalysts, estimated from H2TPR measurements. The activity decreases with the increasing Au particle size in the same order, the reactions then seem structure sensitive. No correlations between the activity and reducibility or the particle size are observed for oxidation of the C-3 hydrocarbons: the sequence of the activity for propane is: Au/FeCr2O4 > Au/CoCr2O4 > Au/MnCr2O4, whereas activity in propene oxidation does not change markedly within the studied catalysts. The reaction mechanism in the oxidation of propane and propene seems then to be different from that of oxidation of CO and ethane.

• 出版日期2012-2